Presidium Instruments Pte Ltd – R&D Intern

Presidium Instruments is a worldwide leader in the development and manufacturing of innovative precision jewelry tools since 1979.

As the leading brand in the jewelry industry, Presidium’s products are distributed by more than 150 authorized resellers in 40 countries worldwide, across America, Europe, the Middle East and Asia.

Presidium Instruments has a young, fresh and passionate team. Recently, we have moved into our new modern office in Singapore, providing a great atmosphere to work. We have the ambition to innovate and introduce several new products to the market in the next 5 years.

BACKGROUND

Optical testing has been used as a method to differentiate between coloured gemstones. Refractometer is such device available in the market that uses refractivity of material to determine the refractive index (R.I.) reading of gemstones. However, refractometer uses index matching liquid to ensure accurate results. Due to its light-bending limitation, refractometer can only read refractive index up to 1.900 and refractometer is manually operated by visual inspection. R.I. above 1.900 will not be able to read by refractometer.

Presidium has devised an optical tester that is able to go beyond 1.900 using the principle of reflectivity. There is a co-relation between reflectivity and refractivity. This co-relation is being used to determine the R.I. reading of gemstones. However, the accuracy is compromised.  

PROJECT OBJECTIVES

The objectives of this project are as follows:

a)     Propose experimental set-up and conduct a study of the effect of multiple-sensors (array sensors) and single-sensor has on the results of R.I. reading

b)     Conduct testing and compare the results of array sensors and single-sensor and provide recommendation of choosing the right sensor

c)      Recommend further testing or propose alternative options to R.I. testing for improved accuracy

PROJECT SCOPE & REQUIREMENTS

The focus of this project is to identify an alternative testing method using optical technology to improve accuracy of test results, alternative testing includes using an array of sensors or other means of optical sensor.

Student will be tasked to:

1) Conduct experiment and collect experimental data to understand the effects of photo-sensor arrays on refractive index of gemstones.

2) Conduct experiment and collect experimental data to understand possibility of narrowing down gemstones by applying both physical properties of gemstones.

3) Involve in simple circuit modification from existing circuit design

======= Job requirements =======

• Strong/Basic knowledge on electronic circuits, PCB design, and firmware

• Familiar with electronic component products

• Self-motivated

• Knowledge in C/C++ programming is a great plus

• Basic soldering skills